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J.A.EDEN,JR. FASTENING DEVICE FOR CHASERS FOR DIE HEADS. APPLICATION FILED FEB. 12. I919.

1,323,584., Patented Dec. 2,1919.

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JAMES A. EDEN, JR, 0F SPRINGFIELD, MASSACHUSETTS, ASSIGNOR T0 WALTER H. FOSTER, OF NEW YORK, N. Y.

FASTENING DEVICE FOR CHASERS FOR DIE-HEADS.

Specification of Letters Patent.

Patented Dec. 2, 1919.

Application filed February 12, 1919. Serial No. 276,472.

To all whom it may concern Be it known that I, JAMns A. EDEN, J r., a citizen of the United States, residing in Springfield, Massachusetts, have invented certain new and useful Improvements in Fastening Devices for Chasers for Die- Heads, of which the following is a specification.

My invention aims to provide an improved fastening device particularly adapted for fastening chasers in carriers which are mounted in die-heads of the class shown, for example, in my application for patent Serial No. 271,631. The present fastening device is simple in design and, with the carrier and chaser, can be cheaply made and will hold the chaser firmly.

The accompanying drawings illustrate embodiments of the invention.

' Figure 1 is a-plan of a chaser-carrier of the type illustrated in my application above referred to with a chaser fastened therein according to my present improvement;

Fig, 2 is a cross-section of the same on the line 22 of Fig. 1;

Figs. 3, 4 and 5 are similar views of other embodiments of the invention;

Fig. 6 is a plan of the carrier and devices of Fig. 5;

Fig. 7 is an enlarged detail.

Referring to the embodiments of the invention illustrated the carrier A is formed at one side with an ear in which is an opening B intended to fit over a trunnion so that the carrier can be rocked to bring the point of the chaser into or out of engagement with the work, and on the opposite side has a pair of alined ears with an opening C to receive the end of a toggle by which the afore said adjustment of the carrier is effected. Extending lengthwise between these two opposite parts is a groove D in which lies the chaser E, the groove being slightly wider than the chaser to permit the latter to be moved freely therein when it is not clamped.

In Fig. 1 I have shown a chaser of a design known in the trade, having a longitudinal shoulder F along its back face which is undercut, and which has been used with a correspondingly shaped fastening device to hold the chaser pressed against the back of its groove as well as down against the bottom thereof. Accordin to my present invention this undercut s oulder is unnecessary, but I have shown it here to indicate that the invention may beused with this design of chaser as well as with other designs. The carrier is formed with a groove G which in its lower corner isshaped similarly to the shoulder F of the chaser. A holding down:

I depend primarily, and may in fact depend solely, for holding the chaser in position on a block K having teeth on its forward face engaging the teeth of the chaser and means for forcing said block against the chaser so as to press the latter against the back of its groove and also down to the bottom of its groove and thus'to prevent its working loose in practice. Various devices may be used for forcing the block K against the chaser and for holding it in the fastening position. In the several figures of the drawing I have shown different devices for this purpose located in the portion of the carrier which is adjacent to the toothed side of the chaser, all of them being easily accessi-ble from the exposed face or side of the carrier.

According to Figs. 1 and2 the block K isv as to clamp the latter .and the chaser in position.

' According to Fig. 3 the block K has an inclined rearv face which is engaged by the lower inclined end of a plug N lying in a vertical recess, which in-turn is engaged by a screw 0 passing through the top of the carrier. The forcing in of the screw 0 will press the lug N down and press the block K inward so as to force the chaser against the back ofits groove. The chaser is shown in this case with a square shoulder F for engagement bv a holding down block H but this, as we have said in connection: with Fig, 2', is not essential.

According to Fig. 4 the toothed block K is upwardly inclined from its toothed face, lies in a corresponding recess in the carrier A and is engaged at its rear 'end by a screw P passing also in an inclined direction downward from the top of the carrier. In the constructions of the previous figures the clamping blocks K and K depend on their beveled engagement with the teeth of the chaser to force the latter down against the bottom of its groove. In the design of Fig. 4 the clamping block K is itself pressed downward as well as inward by its screw 1?.

In this case (as in Fig. 5) the chaser E is shown without a shoulder on its back face and without any holding down device except the toothed block at the front.

According to Fig. 5 the toothed block K is wedge-shaped in plan (see Fig. 6), its tapered back bearing against a correspondingly tapered face of a groove in the carrier. The fastening block is driven in until it holds the chaser E firmly. In this position it is preferably clamped fast by a screw Q passing down through the top face of the carrier and having its head arranged to bear on the top face of the clamping block K sufliciently toprevent by friction the displacement of the latter. The action of the head of the screw Q on the clamping block K is to press the latter down and to press the chaser against the bottom of its groove D while the wedging action of the block K3 itself serves to press the chaser against the back of its groove, and through the inclined faces of the toothed engagement, to press it against the bottom of its groove.

As its end wears or is ground'ofl' it is adjusted by a screw R threaded in the carrier and bearing against a shoulder formed on the lower corner of the chaser. The chaser has teeth or serrations along its entire length and is thus adapted in allpositions of lengthwise adjustment for engagement with the longitudinally fixed clamping block. Fig. '7 shows the relative location and design of the block and chaser so that the lower faces of the teeth S of the block bear with a camming action on the upper faces of the teeth T of the chaser to force the latter down against the bottom of its groove as well as transversely against the back of such groove.

Though I have described with great particularity of detail certain embodiments of my invention yet it is not to be understood therefrom that the invention is restricted to the particular embodiments illustrated. Various modifications thereof in detail and in the arrangement and combination of the parts may be made by those skilled in the art without departure from the invention as defined in the following claims.

What I claim is 1. A chaser-carrier having a groove in combination with a chaser longitudinally adjustable in said groove, a block engaging the face of said chaser and means for press ing said block in a transverse direction against the face of the chaser to press the latter against the back of its groove.

2. A chaser-carrier having a groove to receive the chaser in combination with a block having teeth adapted to engage teeth on the chaser, means for pressing said block block in a transverse direction against the chaser to press the latter against the back of its groove.

3. A chaser-carrier having a groove to receive the chaser in combination with a block having teeth adapted to engage teeth on the chaser, means for pressing said block in a transverse direction against the chaser to press the latter against the back of its 4 groove, said block and chaser being arranged with the lower faces of the teeth of the block bearing with a camming action 4 on the upper facesof the teeth of the chaser to force the latter down as well as press it transversely.

4. A chaser-carrier having a groove in combination with a chaser adjustable longitudinally in said groove and having teeth along the entire length of its face and a longitudinally stationary block having teeth engaging the teeth of the chaser and pressing the latter in a transverse direction against the back of its groove.

5. A chaser-carrier for die-heads shaped for attachment at opposite sideswith parts of the die-head and having a groove extending longitudinally between such points of attachment to receive the chaser in combination with a block having teeth adapted to engage teeth on the chaser and means located in the portion of the carrier adjacent to the toothed side of the chaser for forcing said block against the chaser to press the latter against the back of its groove.

6. A chaser-carrier for die-heads shaped for attachment at opposite sides with parts of the die-head and having a groove extending longitudinally between such points of attachment to receive the chaser in combination with a block having teeth adapted to engage teeth on the chaser and means located in the portion of the carrier adjacent to the'toothed side of the chaser for forcing said block against the chaser to press the latter against the back of its groove and a screw for holding said block pressed against the chaser so as to hold the chaser pressed against the back of its groove.

In witness whereof. I have hereunto signed my name.

JAMES A. EDEN, JR. 

